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STM32 CAN stops transmitting after it is temporarily disconnected from the bus?

SSRIN.1
Associate III

I actually wrote a CAN routine to send commands from STM32MCU to some ECUs, all of which are connected to a single Bus. I noticed that during transmission If I temporarily remove the STM32 MCU from the CAN bus and put it back into the bus. It won't start transmitting and the CAN Tx mailbox always shows full. Has anyone faced this behaviour?

Can anyone advise on this issue?

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